Here are some good links for examples and tutorials, if you have more links, please reply with the link. A mod should make this a sticky.

http://hem.passagen.se/birchdale/carl/
Carls GM pages

http://galileo.spaceports.com/~csos/news.htm
Chronics Site of Stuff

http://dvexample1.tripod.com/
DV example

http://www.freewebs.com/squidknuckles/
Yourself's GM pages

http://www.geocities.com/zmfreak/index.html
ZM Freaks GM stuff

http://www.freewebs.com/simon_donkers/
Simons GM page

http://www.freewebs.com/mksoftgm/index.htm
MK Soft GM site

http://www.geocities.com/eweitenberg/
Eriks pages

www.eateries.com.au/7thaspendale/reg/tutorials.htm

Good idea!
But I can't sticky this because I only mod Off-Topic.

I like this idea. And I have pinned it now.

Heres another one:

http://kylevision.com/download.php?list.5
KyleVision

EDIT: And another one:

http://www.icenfire-online.tk
Icenfire Online

Voodoo Net
http://de.geocities.com/ben0032003//

Heres another one:

http://www.freewebs.com/dragongames/

This is not a GM site, but you can get lots of midis from it
http://www.vgmusic.com/

www.vanbasco.com is also good for midi searching.

Is it ok for me to use some of your midis in my game, you will be in credits.

Sure, go ahead.

Thanks!

those are good sites, i think there going to be very useful for bg music in my next game!